Faster than sound: The Air Force said Friday the X-51A WaveRider flew for more than three minutes under power from its exotic scramjet engine and hit a speed of Mach 5.1
Air Force bosses have revealed they hope to have a hypersonic plane capable of crossing countries in minutes by 2023.
Several tests of hypersonic projectiles have already been carried out.
Air Force Chief Scientist Mica Endsley told Military.com that the Air Force and DARPA, the Pentagon's research entity, plan to have a new and improved hypersonic air vehicle by

The researchers say exposure to light is the key to beating jet lag - and built a free app to tell people how to do it
Michigan researchers say mathematical formulas suggest it is possible to adjust to new time zones far faster than previously thought.
Doctors have long said exposure to light is key, but admit that working out how to best adapt is complex.
'If you get light in the wrong time or wrong way, it'll send you the wrong direction,' said University of Michigan math professor Daniel Forger, who led the research and created a free app to

The X-51A Waverider, shown here in an Air Force illustration, reportedly hit speeds of Mach 6 during a test flight this week. The X-51A Waverider is powered by a Pratt Whitney Rocketdyne SJY61 scramjet engine.
WASHINGTON — An experimental aircraft has set a record for hypersonic flight, flying more than 3 minutes at Mach 6 – six times the speed of sound.
The X-51A Waverider was released from a B-52 Stratofortress off the southern California coast Wednesday morning, the Air Force reported on its website. Its scramjet engine accelerated the vehicle to Mach 6,